| http://www.w3.org/ns/prov#value | - It is still another object of the present invention to provide a holding unit in which if other diameter of the remaining portion of a tool or an article, e.g. a screw driver, to be held by the holding unit is smaller than the diameter of the screw driver gripped by the holding portion, a rather strong pulling down of the screw driver enables to be come off easily out of the hold by the resiliency
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